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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 965 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.31² =
  2. 2.69² =
  3. 3.81² =
  4. 4.41² =
  5. 5.71² =
  6. 6.79² =
  7. 7.89² =
  8. 8.59² =
  9. 9.19² =
  10. 10.21² =
  11. 11.31² =
  12. 12.49² =
  13. 13.79² =
  14. 14.21² =
  15. 15.41² =
  16. 16.49² =
  17. 17.81² =
  18. 18.41² =
  19. 19.19² =
  20. 20.19² =
  21. 21.39² =
  22. 22.91² =
  23. 23.29² =
  24. 24.89² =
  25. 25.71² =
  26. 26.69² =
  27. 27.29² =
  28. 28.19² =
  29. 29.39² =
  30. 30.61² =
  31. 31.89² =
  32. 32.69² =
  33. 33.89² =
  34. 34.79² =
  35. 35.39² =
  36. 36.49² =
  37. 37.41² =
  38. 38.81² =
  39. 39.79² =
  40. 40.49² =

Answer key

  1. 961
  2. 4761
  3. 6561
  4. 1681
  5. 5041
  6. 6241
  7. 7921
  8. 3481
  9. 361
  10. 441
  11. 961
  12. 2401
  13. 6241
  14. 441
  15. 1681
  16. 2401
  17. 6561
  18. 1681
  19. 361
  20. 361
  21. 1521
  22. 8281
  23. 841
  24. 7921
  25. 5041
  26. 4761
  27. 841
  28. 361
  29. 1521
  30. 3721
  31. 7921
  32. 4761
  33. 7921
  34. 6241
  35. 1521
  36. 2401
  37. 1681
  38. 6561
  39. 6241
  40. 2401

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